"There are some who are good, and some who are evil. And the world is full of both."

"Education never ends, Watson. It is a series of lessons, with the greatest for the last."

"Detection is, or ought to be, an exact science and should be treated in the same cold and unemotional manner."

"I have no patience with the arguments of atheists."

"Our minds are like a blank sheet of paper, to be filled in with facts."